Note: Please refer to: http://dx.com/p/81187 Color: White + black - Plastic housing material - Compatible with Bluetooth V3.0 - Effective range: 10m - Frequency: 2.4GHz - Vibrates with incoming calls - Unique novelty gadget that prevents you from missing important calls - Cell phone anti-theft feature never forget your mobile with proximity vibrating alert - Digital clock display - Voltage: 3.3~4.2V - Current: 45mA - Charging time: 2 hours - Stand-by time: up to 72 hours - built-in 500MAh rechargeable lithium battery - Comes with USB charging time (75cm) & English user manual