The recently launched Vivo S1, which was till now sold in offline markets, is set to go on its first online sale in India from today. The 4GB RAM variant will up for grabs via major online sales channels including Flipkart, Amazon, and Vivo e-store. Meanwhile, there are also a couple of 6GB RAM models which will be available soon. Here's our roundup. In India, the 4GB\/128GB variant of the Vivo S1 is available at Rs. 17,990. Talking about offers, buyers can avail 7.5% cashback using HDFC Bank cards and benefits worth Rs. 10,000 from Reliance Jio. There are also 6GB\/64GB and 6GB\/128GB models which are priced at Rs. 18,990 and Rs. 19,990, respectively. However, these variants are not available on sale as of now. Up front, the Vivo S1 features an edge-to-edge display with a small display cut-out and thin bezels on top and bottom. On the rear, it houses triple cameras, LED flash, and gradient design. The phone features a 6.38-inch Super AMOLED display with full-HD+ (1080x2340 pixels) resolution, 19.5:9 aspect ratio, and in-screen fingerprint sensor. On the imaging front, the Vivo S1 houses a trio of sensors including a 16MP (f\/1.8) main sensor, an 8MP (f\/2.2 ) ultra-wide-angle sensor, and a 2MP (f\/2.4) depth sensor. For selfies and video calling, the handset houses a 32MP (f\/2.0) front-facing shooter in the display cut-out. Moreover, both the front and rear cameras support 1080p video recording at 30fps. The Vivo S1 draws power from a MediaTek Helio P65 processor. The company pairs this chipset with 4GB\/6GB RAM and 64GB\/128GB storage. The handset runs Android Pie-based Funtouch OS 9 and packs a 4,500mAh battery with 18W fast-charging support. Furthermore, Vivo S1 offers all standard sensors and latest connectivity options including support for dual-SIMs (Nano), dual-band Wi-Fi, VoLTE, Bluetooth, micro-USB port, and headphone jack.