What is the overall gross margin for the first quarter 
h 4G. The time latency is very important that enables 5G to apply to the cloud and AR/VR. You can imagine when you use the 5G, you know, roaming outside your country and then return to your country then go to the internet, the latency will become longer, and your AR/VR will become a problem again. So in this case, we are, you know, at the one page to have 5G not only in domestic but also for international application, especially for a time latency, we are a unique solution.
So fundamentally, we believe that we are the accelerator of the 5G era. That comes early, at least, one year with our technology in the industry. So that's the product and we are really launching our 5G MiFi embed the handset with our hyper-connectivity solution and we will announce our hyper-connectivity solution in a 5G MiFi in the next month. And we have this solution around that we should announce.
Bob Shen -- Deputy Investor Relations Director
Hi, Vivian. This is Bob Shen. I think -- let me add some color to your second question because as we mentioned we continue to keep investing in our R&D, especially like 5G-related products. As our CEO just mentioned, like a 5G mobile Wi-Fi or like a 5G customer-premises equipment, CPE, and also together with our technology such as 5G millisecond multi-network reselection technology.
And I think, we believe, that all these devices and all these innovative technologies will facilitate us to establish our leading technological position of our PaaS and SaaS platform in the early stage of 5G. Thank you.
Vivian Zhang -- Diamond Equity Research -- Analyst
And that makes sense. Thank you, Bob. Thank you, Chen.
Operator
Thank you. And the next question comes from Lisa Thompson of Zacks Investment.
Lisa Thompson -- Zacks Investment Research -- Analyst
Good evening. So I have a number of questions about the quarter. First off, I see that you had a very good improvement in product sales and the gross margin looks like it might have been a record high. What is causing that? Is that the first time you're shipping 5G devices? What happened in the quarter?
Yimeng Shi -- Chief Financial Officer
The gross margins in the first quarter -- as we -- the overall gross margin we disclosed is stable the past three months. And during the sale of products, we sell these to Japanese market. So that's the pricing and the product sales to Japanese markets are good. And so we have a good, a stable gross margins related to the product selling to Japan.
For service gross margin, it's plus 80 with the mixtures of the service category and depending on the proportions and how much sales and service came from the local community service, how much is the service came from the PaaS and SaaS, and etc. The PaaS and SaaS service is higher gross margins turned in seconds. So when the more PaaS and SaaS service looking into an account then this will give us improvements to our gross margins in the future as we expect. And so when this -- when we -- the national service is recovered, when the vaccination progressed across countries, and the national roaming service is the highest gross margin as well.
So our service gross margin will be improved when we have more service came from PaaS and Saas or came from investment roaming service. Hello?
Lisa Thompson -- Zacks Investment Research -- Analyst
OK. Yes. And with that --
Yimeng Shi -- Chief Financial Officer
Yeah, I think, Lisa --
Lisa Thompson -- Zacks Investment Research -- Analyst
Go ahead.
Yimeng Shi -- Chief Financial Officer
Apart from the Japanese market, as our CFO mentioned, we are also enhancing our e-commerce efforts in other strategic key markets with high growth potential such as the United States and Europe. And one example, our CEO just mentioned that we recorded a high sale in the United States and we also optimizing and improving our website, streamlining our sales function in the local markets to improve -- to continuously improve the user experience and overall satisfaction. That's basically what we do.
Lisa Thompson -- Zacks Investment Research -- Analyst
So the 1.3 million incremen
h 4G. The time latency is very important that enables 5G to apply to the cloud and AR/VR. You can imagine when you use the 5G, you know, roaming outside your country and then return to your country then go to the internet, the latency will become longer, and your AR/VR will become a problem again. So in this case, we are, you know, at the one page to have 5G not only in domestic but also for international application, especially for a time latency, we are a unique solution.
So fundamentally, we believe that we are the accelerator of the 5G era. That comes early, at least, one year with our technology in the industry. So that's the product and we are really launching our 5G MiFi embed the handset with our hyper-connectivity solution and we will announce our hyper-connectivity solution in a 5G MiFi in the next month. And we have this solution around that we should announce.
Bob Shen -- Deputy Investor Relations Director
Hi, Vivian. This is Bob Shen. I think -- let me add some color to your second question because as we mentioned we continue to keep investing in our R&D, especially like 5G-related products. As our CEO just mentioned, like a 5G mobile Wi-Fi or like a 5G customer-premises equipment, CPE, and also together with our technology such as 5G millisecond multi-network reselection technology.
And I think, we believe, that all these devices and all these innovative technologies will facilitate us to establish our leading technological position of our PaaS and SaaS platform in the early stage of 5G. Thank you.
Vivian Zhang -- Diamond Equity Research -- Analyst
And that makes sense. Thank you, Bob. Thank you, Chen.
Operator
Thank you. And the next question comes from Lisa Thompson of Zacks Investment.
Lisa Thompson -- Zacks Investment Research -- Analyst
Good evening. So I have a number of questions about the quarter. First off, I see that you had a very good improvement in product sales and the gross margin looks like it might have been a record high. What is causing that? Is that the first time you're shipping 5G devices? What happened in the quarter?
Yimeng Shi -- Chief Financial Officer
 The gross margins in the first quarter -- as we -- the overall gross margin we disclosed is stable the past three months. And during the sale of products, we sell these to Japanese market. So that's the pricing and the product sales to Japanese markets are good. And so we have a good, a stable gross margins related to the product selling to Japan.
For service gross margin, it's plus 80 with the mixtures of the service category and depending on the proportions and how much sales and service came from the local community service, how much is the service came from the PaaS and SaaS, and etc. The PaaS and SaaS service is higher gross margins turned in seconds. So when the more PaaS and SaaS service looking into an account then this will give us improvements to our gross margins in the future as we expect. And so when this -- when we -- the national service is recovered, when the vaccination progressed across countries, and the national roaming service is the highest gross margin as well.
So our service gross margin will be improved when we have more service came from PaaS and Saas or came from investment roaming service. Hello?
Lisa Thompson -- Zacks Investment Research -- Analyst
OK. Yes. And with that --
Yimeng Shi -- Chief Financial Officer
Yeah, I think, Lisa --
Lisa Thompson -- Zacks Investment Research -- Analyst
Go ahead.
Yimeng Shi -- Chief Financial Officer
Apart from the Japanese market, as our CFO mentioned, we are also enhancing our e-commerce efforts in other strategic key markets with high growth potential such as the United States and Europe. And one example, our CEO just mentioned that we recorded a high sale in the United States and we also optimizing and improving our website, streamlining our sales function in the local markets to improve -- to continuously improve the user experience and overall satisfaction. That's basically what we do.
Lisa Thompson -- Zacks Investment Research -- Analyst
So the 1.3 million incremen