Do I need to buy batteries? Sync O is rechargeable so you won't need to buy batteries, simply charge via the included magnetic USB cable for up to 2.5 hours of play on one full 90-minute charge. Is my smartphone/tablet compatible with the We-Vibe App? You can enjoy the We‑Vibe App on devices running iOS (11 or newer) or Android (7 or newer) with Bluetooth LE (Bluetooth 4.0). The app is not compatible with smartwatches, PC or Mac. What is the maximum Bluetooth range? In a range within 10ft/3 meters of the We-Vibe toy, you can expect a stable connection. Make sure that there isn’t any object in the way that can interfere with the signal. In order to maintain the Bluetooth connection, the app must be active. What are the product specs? Sync O is 10.5cm x 7cm x 10.5cm, weighs 230g and is made from body-safe silicone. It has a run time of 150 mins and a charge time of 90 mins, and is IPX7 waterproof. How Does It Compare? Sync O Add to Cart Sync Lite Add to Cart Sync Go Add to Cart Sync 2 Add to Cart Chorus Add to Cart Customer Reviews 3.4 out of 5 stars 149 3.4 out of 5 stars 407 2.9 out of 5 stars 55 3.4 out of 5 stars 297 3.6 out of 5 stars 350 Price $169.00$169.00 $89.00$89.00 $99.00$99.00 $159.00$159.00 $209.00$209.00 Stimulation Clitoral, G-Point, PenΙs Clitoral, G-Point, PenΙs Clitoral, G-Point, PenΙs Clitoral, G-Point, PenΙs Clitoral, G-Point, PenΙs Waterproof IPX7 IPX4 IPX7 IPX7 IPX7 Vibration Modes 10+ 10+ 10+ 10+ 10+ App Control ✔ ✔ ✔ ✔ ✔ Remote Control ✔ ✘ ✘ ✔ ✔ Squeeze Control ✘ ✘ ✘ ✘ ✔