With built-in rechargeable battery and universal Type-C charging port, you can use your smartphone charger to charge BR-3 conveniently and fast. The Type-C port on BR-3 can also be used for firmware upgrades, in case of incompatibility due to future camera upgrades. You can solve the compatibility problem by upgrading the firmware of BR-3 on your own. Transmission method: Bluetooth 4.2 Operating distance: Approx. 10 m (32.8 ft.) Continuous operating time: Approx. 10 hours* (to continuously control the camera shooting with the fully charged built-in battery) and Charging time: Approx 1 hour and 30 minutes* (charging voltage: 5V, charging current: 0.12A, from low battery level warning to fully charged) Compatible Sony Models: A6700, A6600, A6400*, A6100: A9*, A9 I A9 I. A1 I, A1; A7C, A7CI, A7CR; A7SII; A7 IV, A7 1; A7R V, A7R IV, A7R IVa, A7R I*, A7R lla; ZV-E1, ZV-1F, ZV-11, ZV-1, ZV-E101, ZV-E10; DSC-RX100 VI, RXO I*; FX3, FX30: ILX-LR1; Screen: OLED screen, 128x72 dots Operating environment: Temperature: 0'C to 40°C (32°F to 104°F) Humidity: 85% or less (no condensation) Storage temperature: -10°C to 45°C (14°F to 113°F) Color: White Material: plastic Package Contents: 1* Remote Control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.