The Yealink W73H is a stylish, modern, new generation wireless handset designed for business use. It features a new, more elegant ID design, high wearing comfort, longer battery life and better communication quality. • Handset size: 144.5 mm x 48 mm x 21 mm • Handset weight: 112g • Color: Space Gray • Battery: 1010 mAh, Lithium-ion, 3.7 V, 3.73 Wh - Up to 35 hours talk time (under optimal conditions) - Up to 400 hours standby time (under optimal conditions) • Headphone jack (3.5 mm) • Charger: DC 5V/0.6A output • Power adapter: - Input: 100-240 V~ 50/60 Hz, 0.2 A - Output: 5 V, 0.6 A • 25-key backlit keypad: - Standard ITU telephone keypad, 12 keys, 4x3, with star and pound key - 5 navigation keys (left, right, up, down, OK) - 2 screen keys - 6 function keys (speaker, message, Answer, Cancel, Forward, Mute) - 6 shortcut keys • Operating humidity: 10 - 95% • Operating temperature: -10~+50°C (+14~122°F) • Storage temperature: -30~70°C (-22~158°F)