Bluetooth specifications: V2.0 Wireless hands free control for mobile phones Various ID designs available Wearable on either ear with optional adjustable ear loop Up to 10 hours of talk time and up to 200 hours (more than eight days) standby Dimensions (L x W x T): 42 x 20 x 11.5mm Battery power: 3.7V/110mAh Li-polymer Connection: point-to-point Security: encrypted link Frequency range: 2.4 to 2.48GHz Lightweight (only 9g) and comfortable to wear for long periods Bluetooth is a trademark owned by Bluetooth SIG, Inc.